Authorities have prosecuted a wide range of extremists since the Sept. 11 attacks. In many cases, the men were not accused of planning to do harm on U.S. soil. Instead, they allegedly aided terrorist groups by raising money, recruiting other members or providing support. Officials say the cases illustrate the variety of groups that continue to pose a threat to U.S. interests here and abroad, from the Sunni fundamentalism of Abu Sayyaf to the Shiite militancy of Hezbollah, which is backed by Iran. But some of the most prominent cases have connections to al Qaeda or its former hosts in Afghanistan, the Taliban. Among them:

Zacarias Moussaoui

a French national, pleaded guilty in April to conspiracy charges related to the Sept. 11 plot. He said bin Laden instructed him to fly an airplane into the White House. Six Yemeni men from Lackawanna, N.Y.

pleaded guilty to charges stemming from their attendance at an al Qaeda training camp before the Sept. 11 attacks.

Iyman Faris

a U.S. citizen, was a truck driver who said he met Osama bin Laden. Faris pleaded guilty in May 2003 to plotting to sever the cables on the Brooklyn Bridge.

John Walker Lindh

a California convert to militant Islam, fought alongside Taliban soldiers in Afghanistan and received training at an al Qaeda-run terrorism camp.

Richard Reid

a British national, was thwarted in an attempt to blow up a transatlantic jetliner with explosives hidden in his sneakers.